Add test.support.busy_retry() (#93770)

Add busy_retry() and sleeping_retry() functions to test.support.

1 files changed, 1 insertions, 4 deletions

diff --git a/Lib/test/test_wait3.py b/Lib/test/test_wait3.py
index 4ec7690..15d66ae 100644
--- a/Lib/test/test_wait3.py
+++ b/Lib/test/test_wait3.py
@@ -4,7 +4,6 @@
 import os
 import subprocess
 import sys
-import time
 import unittest
 from test.fork_wait import ForkWait
 from test import support
@@ -20,14 +19,12 @@ class Wait3Test(ForkWait):
         # This many iterations can be required, since some previously run
         # tests (e.g. test_ctypes) could have spawned a lot of children
         # very quickly.
-        deadline = time.monotonic() + support.SHORT_TIMEOUT
-        while time.monotonic() <= deadline:
+        for _ in support.sleeping_retry(support.SHORT_TIMEOUT, error=False):
             # wait3() shouldn't hang, but some of the buildbots seem to hang
             # in the forking tests.  This is an attempt to fix the problem.
             spid, status, rusage = os.wait3(os.WNOHANG)
             if spid == cpid:
                 break
-            time.sleep(0.1)
 
         self.assertEqual(spid, cpid)
         self.assertEqual(os.waitstatus_to_exitcode(status), exitcode)